Uplink transmission power control method and device in wireless cellular communication system

ABSTRACT

Disclosed are a communication technique for merging, with IoT technology, a 5G communication system for supporting a data transmission rate higher than that of a 4G system; and system therefor. The present disclosure can be applied to intelligent services (for example, smart home, smart building, smart city, smart car or connected car, healthcare, digital education, retail, security, and safety-related services, and the like) on the basis of 5G communication technology and IoT-related technology. A power control method for uplink transmission in a wireless cellular communication system is disclosed.

PRIORITY

This application is a Continuation of U.S. patent application Ser. No.17/571,994, which was filed with the U.S. Patent and Trademark Office(USPTO) on Jan. 10, 2022, which is a Continuation of U.S. patentapplication Ser. No. 16/603,673, which was filed with the USPTO on Oct.8, 2019, and issued as U.S. Pat. No. 11,317,358 on Apr. 26, 2022, as aNational Phase Entry of PCT International Application No.PCT/KR2018/004752, which was filed on Apr. 24, 2018, and claims priorityto Korean Patent Application No. 10-2017-0056413, which was filed on May2, 2017, the entire content of each of which is incorporated herein byreference.

BACKGROUND 1. Field

The disclosure relates to a method and an apparatus for controllingpower of uplink transmission in a wireless cellular communicationsystem.

2. Description of Related Art

In order to meet wireless data traffic demands, which have increasedsince to commercialization of a 4G communication system, efforts todevelop an improved 5G communication system or a pre-5G communicationsystem have been made. For this reason, the 5G communication system orthe pre-5G communication system is called a beyond-4G-networkcommunication system or a post-LTE system.

In order to achieve a high data transmission rate, implementation of the5G communication system in an mmWave band (for example, a 60 GHz band)is being considered. In the 5G communication system, technologies suchas beamforming, massive MIMO, full-dimensional MIMO (FD-MIMO), arrayantenna, analog beamforming, and large-scale antenna techniques arebeing discussed as means to mitigate a propagation path loss in themmWave band and increase a propagation transmission distance.

Further, the 5G communication system has developed technologies such asan evolved small cell, an advanced small cell, a cloud radio accessnetwork (RAN), an ultra-dense network, device-to-device communication(D2D), a wireless backhaul, a moving network, cooperative communication,coordinated multi-points (CoMP), and received interference cancellationto improve the system network.

In addition, the 5G system has developed advanced coding modulation(ACM) schemes such as hybrid FSK and QAM modulation (FQAM) and slidingwindow superposition coding (SWSC), and advanced access technologiessuch as filter bank multi-carrier (FBMC), non-orthogonal multiple access(NOMA), and sparse code multiple access (SCMA).

Meanwhile, the Internet has evolved from a human-oriented connectionnetwork, in which humans generate and consume information, into theInternet of Things (IoT), in which distributed components such asobjects exchange and process information. Internet-of-Everything (IoE)technology, in which big-data processing technology is combined with theIoT technology through a connection with a cloud server or the like, hasemerged. In order to the implement IoT, technical factors such as asensing technique, wired/wireless communication, network infrastructure,service-interface technology, and security technology are required, andresearch on technologies such as a sensor network, machine-to-machine(M2M) communication, machine-type communication (MTC), and the like forconnection between objects has recently been conducted. In an IoTenvironment, through collection and analysis of data generated inconnected objects, an intelligent Internet technology (IT) service tocreate new value in peoples' lives may be provided. The IoT may beapplied to fields such as those of a smart home, a smart building, asmart city, a smart car, a connected car, a smart grid, health care, asmart home appliance, or high-tech medical services through theconvergence of conventional information technology (IT) and variousindustries.

Accordingly, various attempts to apply the 5G communication to the IoTnetwork are made. For example, 5G communication technologies such as asensor network, machine-to-machine (M2M) communication, and machine-typecommunication (MTC) are implemented using beamforming, MIMO, andarray-antenna schemes. The application of a cloud RAN as big-dataprocessing technology may be an example of convergence of the 5Gtechnology and the IoT technology.

According to the recent development of long-term evolution (LTE) andLTE-Advanced, a method and an apparatus for controlling power of uplinktransmission in a wireless cellular communication system are required.

SUMMARY

The present disclosure has been made to address at least thedisadvantages described above and to provide at least the advantagesdescribed below. The disclosure provides a method by which a terminalcontrols the power of uplink transmission within a maximum transmissionpower value of the terminal and an apparatus according thereto in orderto maintain uplink coverage when a transmission interval of uplinktransmission, such as an uplink data channel, an uplink control, or anuplink sounding reference signal, varies in units of OFDM symbols or inorder to satisfy reliability in a service having ultra reliability as arequirement thereof.

In accordance with an aspect of the disclosure, provided is a methodperformed by a terminal in a communication system, the method includingreceiving, from a base station via higher layer signaling, aconfiguration including information associated with a number of physicaluplink control channel (PUCCH) symbols for a PUCCH format; receiving,from the base station on a physical downlink control channel (PDCCH), apower control command for a PUCCH; identifying a transmission power forthe PUCCH based on the power control command for the PUCCH and a PUCCHtransmission power adjustment component, wherein the PUCCH transmissionpower adjustment component is obtained by the number of the PUCCHsymbols for the PUCCH format and the PUCCH transmission power adjustmentcomponent is increased as the number of the PUCCH symbols for the PUCCHformat is decreased; and transmitting, to the base station, the PUCCHbased on the transmission power.

In accordance with a further embodiment of the present disclosure,provided is a method performed by a base station in a communicationsystem, the method including transmitting, to a terminal via higherlayer signaling, a configuration including information associated with anumber of PUCCH symbols for a PUCCH format; transmitting, to theterminal on a PDCCH, a power control command for a PUCCH; and receiving,from the terminal, the PUCCH transmitted based on a transmission power,with the transmission power being based on the power control command forthe PUCCH and a PUCCH transmission power adjustment component, and withthe PUCCH transmission power adjustment component being obtained by thenumber of the PUCCH symbols for the PUCCH format and the PUCCHtransmission power adjustment component is increased as the number ofthe PUCCH symbols for the PUCCH format is decreased.

In accordance with another aspect of the present disclosure, provided isa terminal in a wireless communication system, the terminal including atransceiver and a controller coupled with the transceiver and beingconfigured to receive, from a base station via higher layer signaling, aconfiguration including information associated with a number of PUCCHsymbols for a PUCCH format; receive, from the base station on a PDCCH, apower control command for a PUCCH; identify a transmission power basedon the power control command for the PUCCH and a PUCCH transmissionpower adjustment component, with the PUCCH transmission power adjustmentcomponent being obtained by the number of the PUCCH symbols for thePUCCH format and the PUCCH transmission power adjustment component isincreased as the number of the PUCCH symbols for the PUCCH format isdecreased; and transmit, to the base station, the PUCCH based on thetransmission power.

In accordance with a further aspect of the present disclosure, providedis a base station in a wireless communication system, the base stationincluding a transceiver a controller coupled with the transceiver andbeing configured to transmit, to a terminal via higher layer signaling,a configuration including information associated with a number of PUCCHsymbols for a PUCCH format; transmit, to the terminal on a PDCCH, apower control command for a PUCCH; and receive, from the terminal, thePUCCH transmitted based on a transmission power, with the transmissionpower being based on the power control command for the PUCCH and a PUCCHtransmission power adjustment component, and with the PUCCH transmissionpower adjustment component being obtained by the number of the PUCCHsymbols for the PUCCH format and the PUCCH transmission power adjustmentcomponent is increased as the number of the PUCCH symbols for the PUCCHformat is decreased.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other aspects, features and advantages of certainembodiments of the disclosure will be more apparent from the followingdetailed description taken in conjunction with the accompanyingdrawings, in which:

FIG. 1 illustrates the basic structure of time-frequency regions in theLTE system;

FIG. 2 illustrates an example in which 5G services are multiplexed inone system;

FIG. 3 illustrates an embodiment of a communication system to which thedisclosure is applied;

FIG. 4 illustrates the operation of a terminal and a base stationoperating in a communication system to which a proposed embodiment isapplied;

FIG. 5 illustrates PUCCH transmission in the 5G system;

FIG. 6 illustrates uplink transmission such as PUCCH, sounding referencesignal (SRS), and PUSCH transmission in the 5G system;

FIG. 7 illustrates procedures of the base station and the terminalaccording to embodiments of the disclosure;

FIG. 8 illustrates a base station apparatus according to the disclosure;and

FIG. 9 illustrates a terminal apparatus according to the disclosure.

DETAILED DESCRIPTION

Hereinafter, embodiments of the disclosure will be described in detailin conjunction with the accompanying drawings. In the followingdescription of the disclosure, a detailed description of known functionsor configurations incorporated herein will be omitted when it may makethe subject matter of the disclosure rather unclear. The terms whichwill be described below are terms defined in consideration of thefunctions in the disclosure, and may be different according to users,intentions of the users, or customs. Therefore, the definitions of theterms should be made based on the contents throughout the specification.

The advantages and features of the disclosure and ways to achieve themwill be apparent by making reference to embodiments as described belowin detail in conjunction with the accompanying drawings. However, thedisclosure is not limited to the embodiments set forth below, but may beimplemented in various different forms. The following embodiments areprovided only to completely disclose the disclosure and inform thoseskilled in the art of the scope of the disclosure, and the disclosure isdefined only by the scope of the appended claims. Throughout thespecification, the same or like reference numerals designate the same orlike elements.

Here, it will be understood that each block of the flowchartillustrations, and combinations of blocks in the flowchartillustrations, can be implemented by computer program instructions.These computer program instructions can be provided to a processor of ageneral purpose computer, special purpose computer, or otherprogrammable data processing apparatus to produce a machine, such thatthe instructions, which execute via the processor of the computer orother programmable data processing apparatus, create means forimplementing the functions specified in the flowchart block or blocks.These computer program instructions may also be stored in a computerusable or computer-readable memory that can direct a computer or otherprogrammable data processing apparatus to function in a particularmanner, such that the instructions stored in the computer usable orcomputer-readable memory produce an article of manufacture includinginstruction means that implement the function specified in the flowchartblock or blocks. The computer program instructions may also be loadedonto a computer or other programmable data processing apparatus to causea series of operational steps to be performed on the computer or otherprogrammable apparatus to produce a computer implemented process suchthat the instructions that execute on the computer or other programmableapparatus provide steps for implementing the functions specified in theflowchart block or blocks.

And each block of the flowchart illustrations may represent a module,segment, or portion of code, which includes one or more executableinstructions for implementing the specified logical function(s). Itshould also be noted that in some alternative implementations, thefunctions noted in the blocks may occur out of the order. For example,two blocks shown in succession may in fact be executed substantiallyconcurrently or the blocks may sometimes be executed in the reverseorder, depending upon the functionality involved.

As used herein, the “unit” refers to a software element or a hardwareelement, such as a Field Programmable Gate Array (FPGA) or anApplication Specific Integrated Circuit (ASIC), which performs apredetermined function. However, the “unit” does not always have ameaning limited to software or hardware. The “unit” may be constructedeither to be stored in an addressable storage medium or to execute oneor more processors. Therefore, the “unit” includes, for example,software elements, object-oriented software elements, class elements ortask elements, processes, functions, properties, procedures,sub-routines, segments of a program code, drivers, firmware,micro-codes, circuits, data, database, data structures, tables, arrays,and parameters. The elements and functions provided by the “unit” may beeither combined into a smaller number of elements, “unit” or dividedinto a larger number of elements, “unit”. Moreover, the elements and“units” may be implemented to reproduce one or more CPUs within a deviceor a security multimedia card.

Hereinafter, an embodiment of the disclosure will be described in detailwith reference to the accompanying drawings. In the followingdescription of the disclosure, a detailed description of known functionsor configurations incorporated herein will be omitted when it may makethe subject matter of the disclosure rather unclear. The terms whichwill be described below are terms defined in consideration of thefunctions in the disclosure, and may be different according to users,intentions of the users, or customs. Therefore, the definitions of theterms should be made based on the contents throughout the specification.

Further, the detailed description of embodiments of the disclosure ismade mainly based on a wireless communication system based on OFDM,particularly 3GPP EUTRA standard, but the subject matter of thedisclosure can be applied to other communication systems having asimilar technical background and channel form after a littlemodification without departing from the scope of the disclosure and theabove can be determined by those skilled in the art.

Meanwhile, research on the coexistence of new 5G communication (alsoreferred to as “new radio (NR) communication” in the disclosure) and theconventional LTE communication in the same spectrum is being conductedfor implementation in a mobile communication system.

The disclosure relates to a wireless communication system, and moreparticularly to a method and an apparatus in which a terminal capable oftransmitting and receiving data in at least one of differentcommunication systems existing in one carrier frequency or a pluralityof carrier frequencies transmits and receives data to and from each ofthe communication systems.

In general, a mobile communication system is developed to provide voiceservices while guaranteeing the mobility of users. However, the mobilecommunication system has gradually expanded its service scope from voiceto data services. In recent years, the mobile communication system hasevolved to a degree such that it is capable of providing high-speed dataservices. However, since resources are lacking and users demand higherspeed services in the mobile communication system currently providingservice, a further improved mobile communication system is needed.

To meet the demands, standardization of long-term evolution (LTE) isprogressed by the 3^(rd)-generation partnership project (3GPP), as oneof the next-generation mobile communication systems that are beingdeveloped. LTE is technology of implementing high-speed packet-basedcommunication with a maximum transmission rate of 100 Mbps. To this end,several methods are under discussion, including a method of reducing thenumber of nodes located on a communication channel by simplifying anetwork architecture, a method of making wireless protocols as close aspossible to a wireless channel, and the like.

When decoding fails upon initial transmission, the LTE system employs ahybrid automatic repeat request (HARQ) scheme of retransmitting thecorresponding data in a physical layer. In the HARQ scheme, when areceiver does not accurately decode data, the receiver transmitsinformation (negative acknowledgement: NACK) informing a transmitter ofdecoding failure, and thus the transmitter may re-transmit thecorresponding data on the physical layer. The receiver combines thedata, which the transmitter retransmits, with the data the decoding ofwhich failed, thereby increasing data reception performance. Also, whenthe receiver accurately decodes data, the receiver transmits information(ACK) reporting that decoding is successful, so that the transmitter maytransmit new data.

FIG. 1 illustrates the basic structure of time-frequency regions, whichare radio resource regions in which data or a control channel istransmitted in a downlink of an LTE system.

In FIG. 1 , the horizontal axis indicates a time region and the verticalaxis indicates a frequency region. In the time region, the minimumtransmission unit is an OFDM symbol. One slot 106 consists of N_(symb)OFDM symbols 102, and one subframe 105 consists of two slots. The lengthof one slot is 0.5 ms, and the length of one subframe is 1.0 ms. A radioframe 114 is a time region unit consisting of 10 subframes. The minimumtransmission unit in the frequency region is a subcarrier, and theentire system transmission bandwidth consists of a total of N_(BW)subcarriers 104.

In the time-frequency regions, the basic resource unit is a resourceelement (RE) 112, and an RE is expressed by an OFDM symbol index and asubcarrier index. A resource block (RB) (or physical resource block(PRB) 108 is defined by N_(symb) consecutive OFDM symbols 102 in thetime region and N_(RB) consecutive subcarriers 110 in the frequencyregion. Accordingly, one RB 108 consists of N_(symb)×N_(RB) REs 112. Ingeneral, the minimum transmission unit of data is an RB. In the LTEsystem, generally, N_(symb)=7 and N_(RB)=12. N_(BW) and N_(RB) areproportional to the bandwidth of a system transmission band. The datarate increases in proportion to the number of RBs scheduled for theterminal. The LTE system defines and operates 6 transmission bandwidths.In the case of a frequency division duplex (FDD) system, in which thedownlink and the uplink are divided according to frequency, a downlinktransmission bandwidth and an uplink transmission bandwidth may bedifferent from each other. A channel bandwidth refers to aradio-frequency (RF) bandwidth, corresponding to the system transmissionbandwidth. [Table 1] indicates the relationship between a systemtransmission bandwidth and a channel bandwidth defined in the LTEsystem. For example, if the LTE system has a channel bandwidth of 10MHz, the transmission bandwidth consists of 50 RBs.

TABLE 1 Channel bandwidth BW_(channel) [MHz] 1.4 3 5 10 15 20Transmission bandwidth 6 15 25 50 75 100 configuration

Downlink control information is transmitted within N initial OFDMsymbols within the subframe. Generally, N={1, 2, 3}. Therefore, thevalue of N may be changed for each subframe on the basis of the amountof control information to be transmitted in the current subframe. Thecontrol information may include a control channel transmission intervalindicator indicating the number of OFDM symbols via which controlinformation is to be transmitted, scheduling information associated withdownlink data or uplink data, a HARQ ACK/NACK signal, or the like.

In the LTE system, scheduling information associated with downlink dataor uplink data may be transmitted from a base station to the terminalvia downlink control information (DCI). The uplink (UL) is a radio linkthrough which the terminal transmits data or control signals to the basestation, and the downlink (DL) is a radio link through which the basestation transmits data or control signals to the terminal. The DCI isdefined in various formats. A DCI format may be determined and appliedfor operation based on whether scheduling information is for uplink data(UL grant) or for downlink data (DL grant), whether the DCI is compactDCI of which the control information is small, whether spatialmultiplexing using multiple antennas is applied, whether the DCI is usedfor controlling power, and the like. For example, DCI format 1,corresponding to scheduling control information of downlink data (DLgrant), may be configured to include at least the following controlinformation.

-   -   Resource allocation type 0/1 flag: indicates whether a resource        allocation type is type 0 or type 1. Type 0 applies a bitmap        scheme and allocates resources in units of resource block groups        (RBGs). In the LTE system, a basic scheduling unit is a resource        block (RB), expressed by time and frequency region resources,        and an RBG consists of a plurality of RBs and is used as a basic        scheduling unit in the type 0 scheme. Type 1 allows allocation        of a predetermined RB in an RBG.    -   Resource block assignment: indicates RBs allocated to data        transmission. Indicated resources are determined according to        the system bandwidth and resource allocation scheme.    -   Modulation and coding scheme (MCS): indicates the modulation        scheme used for data transmission and the size of a transport        block, which is the data to be transmitted.    -   HARQ process number: indicates a process number of HARQ.    -   New data indicator: indicates HARQ initial transmission or HARQ        retransmission.    -   Redundancy version: indicates the redundancy version of HARQ.    -   Transmit power control (TPC) command for PUCCH: indicates a        transmission power control command for a PUCCH, which is an        uplink control channel.

The DCI is transmitted through a PDCCH or an enhanced PDCCH (EPDCCH),which is a downlink physical control channel, via a channel-coding andmodulation process.

In general, the DCI is channel-coded independently for each terminal,and is then configured and transmitted as an independent PDCCH. In thetime region, a PDCCH is mapped and transmitted during the controlchannel transmission interval. The frequency region mapping position ofa PDCCH is determined by an identifier (ID) of each terminal, and ispropagated to the entire system transmission band.

Downlink data is transmitted through a physical downlink shared channel(PDSCH), which is a physical downlink data channel. The PDSCH istransmitted after the control channel transmission interval, and thedetailed mapping location in the frequency region and schedulinginformation such as the modulation scheme are indicated through DCItransmitted through the PDCCH.

Via an MCS including 5 bits in the control information included in theDCI, the base station may report the modulation scheme applied to aPDSCH to be transmitted to the terminal and the size (transport blocksize (TBS)) of data to be transmitted. The TBS corresponds to the sizebefore channel coding for error correction is applied to the data (TB)to be transmitted by the BS.

The modulation scheme supported by the LTE system includes QuadraturePhase Shift Keying (QPSK), 16 Quadrature Amplitude Modulation (16QAM),and 64QAM. Modulation orders (Qm) correspond to 2, 4, and 6respectively. That is, in the case of QPSK modulation, 2 bits aretransmitted per symbol. In the case of 16QAM modulation, 4 bits aretransmitted per symbol. In the case of 64QAM modulation, 6 bits aretransmitted per symbol.

Unlike LTE Rel-8, 3GPP LTE Rel-10 has adopted a bandwidth extensiontechnology in order to support a larger amount of data transmission. Thetechnology called bandwidth extension or carrier aggregation (CA) mayexpand the band and thus increase the amount of data capable of beingtransmitted through the expanded band compared to the LTE Rel-8terminal, which transmits data in one band. Each of the bands is calleda component carrier (CC), and the LTE Rel-8 terminal is defined to haveone component carrier for each of the downlink and the uplink. Further,a group of uplink component carriers connected to downlink componentcarriers through SIB-2 is called a cell. The SIB-2 connectionrelationship between the downlink component carrier and the uplinkcomponent carrier is transmitted through a system signal or ahigher-layer signal. The UE supporting CA may receive downlink datathrough a plurality of serving cells and transmit uplink data.

In LTE Rel-10, when the base station has difficulty in transmitting aPDCCH to a particular terminal in a particular serving cell, the basestation may transmit the PDCCH in another serving cell and configure acarrier indicator field (CIF) as a field indicating that thecorresponding PDCCH is a physical downlink shared channel (PDSCH) or aphysical uplink shared channel (PUSCH) of the other serving cell. TheCIF may be configured in the terminal supporting CA. The CIF isdetermined to indicate another serving cell by adding 3 bits to thePDCCH in a particular serving cell, and the CIF is included only whencross-carrier scheduling is performed, and if CIF is not included,cross-carrier scheduling is not performed. When the CIF is included indownlink allocation information (DL assignment), the CIF is defined toindicate a serving cell to which a PDSCH scheduled by the DL assignmentis transmitted. When the CIF is included in uplink resource allocationinformation (UL grant), the CIF is defined to indicate a serving cell towhich a PUSCH scheduled by the UL grant is transmitted.

As described above, carrier aggregation (CA), which is a bandwidthexpansion technology, is defined in LTE-10, and thus a plurality ofserving cells may be configured in the terminal. The UE periodically oraperiodically transmits channel information of the plurality of servingcells to the base station for data scheduling of the base station. Thebase station schedules and transmits data for each carrier, and theterminal transmits A/N feedback of data transmitted for each carrier.LTE Rel-10 is designed to transmit a maximum of 21 bits of A/N feedback,and is designed to transmit A/N feedback and to discard the channelinformation when transmission of A/N feedback and transmission ofchannel information overlap in one subframe. LTE Rel-11 is designed tomultiplex A/N feedback and channel information of one cell and transmitthe A/N feedback corresponding to a maximum of 22 bits and the channelinformation of one cell in transmission resources of PUCCH format 3through PUCCH format 3.

A scenario in which a maximum of 32 serving cells is configured isassumed in LTE-13, and the concept of expanding the number of servingcells up to a maximum of 32 serving cells using not only a licensed bandbut also an unlicensed band has been devised. Further, LTE Rel-13provides an LTE service in an unlicensed band such as a band of 5 GHz inconsideration of limitation on the number of licensed bands, such as theLTE frequency, which is called licensed assisted access (LAA). Carrieraggregation technology of LTE is applied to LAA to support an LTE cell,which is a licensed band, as a P cell and an LAA cell, which is anunlicensed band, as an S cell. Accordingly, as in LTE, feedbackgenerated in the LAA cell corresponding to the SCell should betransmitted only in the PCell, and the LAA cell may freely apply adownlink subframe and an uplink subframe. Unless specially mentioned inthis specification, “LTE” refers to all technologies evolved from LTE,such as LTE-A and LAA.

Meanwhile, as a post-LTE communication system, a 5^(th)-generationwireless cellular communication system (hereinafter, referred to as “5G”or “NR” in the specification) should freely reflect the variousrequirements of users and service providers, so that services that meetvarious requirements should be supported.

Accordingly, 5G may define various 5G services such as enhanced mobilebroadband communication (hereinafter, referred to as eMBB in thisspecification), massive machine-type communication (hereinafter,referred to as mMTC in this specification), and ultra-reliable andlow-latency communications (hereinafter, referred to as URLLC in thisspecification) by the technology for satisfying requirements selectedfor 5G services, among requirements of a maximum terminal transmissionrate of 20 Gbps, a maximum terminal speed of 500 km/h, a maximum delaytime of 0.5 ms, and a terminal access density of 1,000,000 UEs/km².

For example, in order to provide eMBB in 5G, a maximum transmissionspeed of the terminal corresponding to 20 Gbps may be provided indownlink and a maximum transmission speed of the terminal correspondingto 10 Gbps may be provided in uplink from the viewpoint of one basestation. Also, the average transmission rate of the terminal that isactually experienced should be increased. In order to satisfy suchrequirements, improvement of transmission/reception technologies,including a further improved multi-input multi-output transmissiontechnology, is needed.

Also, in order to support an application service such as the Internet ofthings (IoT), mMTC is considered in 5G. The mMTC has requirements ofsupporting access by massive numbers of terminals within a cell,improving coverage of the terminal, increasing effective batterylifetime, and reducing the costs of the terminal in order to efficientlysupport IoT. IoT connects various sensors and devices to provide acommunication function, and thus should support a large number ofterminals (for example, 1,000,000 terminals/km²) within a cell. Further,in the mMTC, the terminal is highly likely to be located in a shade areasuch as the basement of a building or an area that cannot be covered bythe cell due to the characteristics of the service, and thus mMTCrequires wider coverage than the coverage provided by eMBB. The mMTC ishighly likely to be configured by cheap terminals, and it is difficultto frequently change a battery of the terminal, so a long battery lifeis needed.

Last, the URLLC is cellular-based wireless communication used for aparticular purpose and corresponds to a service used for remote controlof a robot or a machine device, industrial automation, unmanned aerialvehicles, remote health control, and emergency notification, and thusshould provide ultra-low-latency and ultra-reliable communication. Forexample, the URLLC should meet a maximum delay time shorter than 0.5 msand also has requirements to provide a packet error rate equal to orlower than 10⁻⁵. Therefore, for the URLLC, a transmit time interval(TTI) shorter than that of a 5G service such as eMBB should be provided,and moreover, it is required to perform design so as to allocate wideresources in a frequency band.

The services under consideration for adoption in the 5^(th)-generationwireless cellular communication system should be provided as a singleframework. That is, in order to efficiently manage and controlresources, it is preferable to perform control and transmission suchthat the services are integrated into one system rather than toindependently operate the services.

FIG. 2 illustrates an example in which services under consideration by5G are transmitted through one system.

In FIG. 2 , frequency-time resources 201 used in 5G may include afrequency axis 202 and a time axis 203. FIG. 2 illustrates an example inwhich 5G operates eMBB 205, mMTC 206, and URLLC 207 within oneframework. Further, as a service which is additionally underconsideration for implementation in 5G, an enhanced mobilebroadcast/multicast service (eMBMS) 208 for providing a cellular-basedbroadcast service may be considered. The services under considerationfor 5G, such as the eMBB 205, the mMTC 206, the URLLC 207, and the eMBMS208, may be multiplexed through time-division multiplexing (TDM) orfrequency-division multiplexing (FDM) within one system frequencybandwidth operated by 5G, and spatial-division multiplexing may be alsoconsidered. In the case of the eMBB 205, it is preferable to occupy andtransmit as many frequency bandwidths as possible for a particular timein order to provide the increased data transmission rate. Accordingly,it is preferable that the service of the eMBB 205 betime-division-multiplexed (TDM) with another service within the systemtransmission bandwidth 201, but it is also preferable that the serviceof the eMBB 205 be frequency-division-multiplexed with other serviceswithin the system transmission bandwidth according to the need of theother services.

Unlike other services, the mMTC 206 requires an increased transmissioninterval in order to secure wider coverage, and may secure the coverageby repeatedly transmitting the same packet within the transmissioninterval. In order to simultaneously reduce the terminal complexity andthe terminal price, the transmission bandwidth within which the terminalis capable of performing reception is limited. When the requirementsdescribed above are considered, it is preferable that the mMTC 206 befrequency-division-multiplexed with other services within thetransmission system bandwidth 201.

It is preferable that the URLLC 207 have a shorter transmit timeinterval (TTI) compared to other services in order to meet theultra-low-latency requirements of the service. Also, in order to meetthe ultra-reliability requirement, a low coding rate is needed, so thatit is preferable to occupy a wide frequency bandwidth. When therequirements of URLLC 207 are considered, it is preferable that theURLLC 207 be time-division-multiplexed with other services within thetransmission system bandwidth 201 of 5G.

The above-described services may have different transmission/receptionschemes and transmission/reception parameters in order to meet therequirements of the services. For example, the services may havedifferent numerologies depending on the requirements thereof. Anumerology includes a cyclic prefix (CP) length, subcarrier spacing, anOFDM symbol length, and a transmission time interval (TTI) in anorthogonal frequency-division multiplexing (OFDM) or orthogonalfrequency-division multiple access (OFDMA)-based communication system.In an example in which the services have different numerologies, theeMBMS 208 may have a longer CP than other services. Since the eMBMStransmits higher traffic based on broadcasting, the same data may betransmitted in all cells. At this time, if signals received by aplurality of cells reach the CP length, the terminal may receive anddecode all of the signals and thus obtain a single frequency network(SFN) diversity gain, and accordingly, even a terminal located at a cellboundary can receive broadcasting information without any coveragerestriction. However, if the CP length is relatively longer than otherservices, waste occurs due to CP overhead in order to support the eMBMSin 5G, and thus a longer OFDM symbol is required than in the case ofother services, which results in narrower subcarrier spacing compared toother services.

Further, as an example in which different numerologies are used forservices in 5G, a shorter OFDM symbol may be required as a shorter TTIis needed compared to other services, and moreover, wider subcarrierspacing may be required in the case of URLLC.

Meanwhile, even when services and technologies for 5G phase 2 orbeyond-5G are multiplexed to the 5G operation frequency in the future,there are requirements to provide technologies and service of 5G phase 2or beyond-5G so that no backward-compatibility problem occurs inoperation of previous 5G technologies. The requirement is referred to as“forward compatibility”, and techniques for satisfying forwardcompatibility should be considered when 5G is initially designed. In theinitial LTE standardization step, consideration of forward compatibilitywas inadequate, and thus there may be a limitation on providing a newservice within an LTE framework. For example, in the case of enhancedmachine-type communication (eMTC) applied to LTE release-13, theterminal is able to communicate only at a frequency of 1.4 MHzregardless of the system bandwidth provided by the serving cell in orderto reduce the cost of the terminal through reduction in complexity ofthe terminal. Meanwhile, since the terminal supporting eMTC cannotreceive a PDCCH transmitted in the entire band of the conventionalsystem transmission bandwidth, there is a limitation in that a signalcannot be received in a time interval in which the PDCCH is transmitted.Accordingly, the 5G communication system should be designed toefficiently coexist with services considered after the 5G communicationsystem. For forward compatibility of the 5G communication system,resources should be freely allocated and transmitted so that servicesconsidered in the future can be freely transmitted in a time-frequencyresource region supported by the 5G communication system. In order tosupport forward compatibility in the 5G communication system, the 5Gterminal is supported to receive indication of allocation of reservedresources through at least a higher-layer signal.

One TTI may be defined as one slot and may consist of 14 OFDM symbols or7 OFDM symbols in 5G. Accordingly, in the case of subcarrier spacing of15 kHz, one slot has a length of 1 ms or 0.5 ms. Further, one TTI may bedefined as one mini-slot or sub-slot for emergency transmission andtransmission in an unlicensed band in 5G, and one mini-slot may haveOFDM symbols ranging from 1 to (the number of OFDM symbols of theslot)−1. If the length of one slot corresponds to 14 OFDM symbols, thelength of the mini-slot may be determined as one of 1 to 13 OFDMsymbols. Alternatively, instead of a separate definition of the term“slot” or “mini-slot”, one TTI may be defined only by the slot.Accordingly, one slot may be differently configured for each terminal,and one slot may have OFDM symbols ranging from 1 to “the number of OFDMsymbols of the slot”. The length of the slot or the mini-slot may bedefined according to a standard, and may be transmitted through ahigher-layer signal or system information and received by the terminal.The slot or the mini-slot may be defined to have various transmissionformats, and may be classified into the following formats.

-   -   DL only slot or full DL slot: includes only downlink sections        and supports only downlink transmission.    -   L-centric slot: includes downlink sections, GP, and uplink        sections, and has a larger number of OFDM symbols in the        downlink section than in the uplink section.    -   UL-centric slot: includes downlink sections, GP, and uplink        sections, and has a smaller number of OFDM symbols in the        downlink section than in the uplink section.    -   UL-only slot or full-DL slot: includes only uplink sections and        supports only uplink transmission.

In the above description, only the slot formats are divided, but themini-slot may also be classified in the same way. That is, the mini slotmay be classified into a DL-only mini slot, a DL-centric mini slot, aUL-centric mini slot, and a UL-only mini slot.

The transmission interval (or a transmission start symbol and atransmission end symbol) of uplink transmission may vary depending onthe format of the slot or the mini-slot. Even when reserved resourcesare configured in one slot, the transmission interval of uplinktransmission may be changed. Further, the case in which an uplinkcontrol channel having a short transmission interval (hereinafter,referred to as a short PUCCH in the disclosure) to minimize atransmission delay and an uplink control channel having a longtransmission interval (hereinafter, referred to as a long PUCCH in thedisclosure) to acquire sufficient cell coverage coexist in one slot or aplurality of slots and the case in which the uplink control channel ismultiplexed in one slot or a plurality of slots, such as transmission ofan uplink sounding signal like an SRS, should be considered.Accordingly, when the transmission interval of uplink transmission, suchas an uplink data channel, an uplink control channel, or an uplinksounding reference signal, varies in units of OFDM symbols, a method ofcontrolling the power of the uplink transmission within a maximumtransmission power value of the terminal is needed in order to maintainthe uplink coverage. In order to satisfy the reliability of uplinktransmission in a service having ultra reliability as a requirementthereof, a method of controlling the power of the uplink transmissionwithin the maximum transmission power value of the terminal is needed.

The disclosure provides a method of controlling the power of the uplinktransmission within the maximum transmission power value of the terminalin consideration of the number of OFDM symbols or reliability in orderto maintain the uplink coverage of the uplink transmission and tosatisfy the reliability of the uplink transmission in the slot or themini-slot of the base station and the terminal.

Hereinafter, exemplary embodiments of the disclosure will be describedin detail with reference to the accompanying drawings. Here, it is notedthat identical reference numerals denote the same structural elements inthe accompanying drawings. Further, a detailed description of a knownfunction and configuration which may make the subject matter of thedisclosure unclear will be omitted.

Further, although the following detailed description of embodiments ofthe disclosure will be directed to LTE and 5G systems, it can beunderstood by those skilled in the art that the main gist of thedisclosure may also be applied to any other communication system havingsimilar technical backgrounds and channel formats, with a slightmodification, without substantially departing from the scope of thedisclosure.

Hereinafter, the 5G system for transmitting and receiving data in the 5Gcell will be described.

FIG. 3 illustrates an embodiment of a communication system to which thedisclosure is applied. The drawings illustrate the form in which the 5Gsystem is operated, and the schemes proposed by the disclosure can beapplied to the system of FIG. 3 .

Referring to FIG. 3 , the case in which a 5G cell 302 is operated by onebase station 301 in a network is shown. A terminal 303 is a 5G-capableterminal having a 5G transmission/reception module. The terminal 303acquires synchronization through a synchronization signal transmitted inthe 5G cell 302, receives system information, and then transmits andreceives data to and from the base station 301 through the 5G cell 302.In this case, there is no limitation as to the duplexing method of the5G cell 302. If the 5G cell is a P cell, uplink control transmission isperformed through the 5G cell 302. In the 5c system, the 5G cell mayhave a plurality of serving cells, and may support a total of 32 servingcells. It is assumed that the BS 301 includes a 5Gtransmission/reception module (system) in the network and can manage andoperate the 5G system in real time.

Subsequently, a procedure in which the base station 301 configures 5Gresources and transmits and receives data to and from the 5G-capableterminal 303 in resources for 5G will be described with reference toFIG. 4 .

In step 411, the base station 301 transmits synchronization for 5G,system information, and higher-layer configuration information to the5G-capable terminal 303. With respect to the synchronization signal for5G, separate synchronization signals may be transmitted for eMBB, mMTC,and URCCL using different numerologies, and a common synchronizationsignal may be transmitted through specific 5G resources using onenumerology. With respect to the system information, common systeminformation may be transmitted through specific 5G resources using onenumerology, and separate system information may be transmitted for eMBB,mMTC, and URLLC using different numerologies. The system information andthe higher configuration information may include configurationinformation indicating whether to use the slot or the mini-slot for datatransmission and reception, the number of OFDM symbols of the slot orthe mini-slot, and the numerology therefor. Further, when reception of adownlink common control channel is configured in the UE, the systeminformation and the higher configuration information may includeconfiguration information related to the reception of the downlinkcommon control channel. When the terminal controls the power of uplinktransmission, configuration information related to power control may beincluded.

In step 412, the base station 301 transmits and receives data for the 5Gservice to and from the 5G-capable terminal 303 through 5G resources.

When transmitting and receiving data to and from the terminal, the basestation may transmit a downlink control channel required for schedulingthe data and insert a command required by the terminal for controllinguplink transmission into the downlink control channel.

Subsequently, the procedure in which the 5G-capable terminal 303receives the configuration of 5G resources from the base station 301 andtransmits and receives data through the 5G resources will be described.

In step 421, the 5G-capable terminal 303 acquires synchronization fromthe synchronization signal for 5G transmitted by the base station 301and receives the system information and the higher configurationinformation transmitted by the base station 301. With respect to thesynchronization signal for 5G, separate synchronization signals may betransmitted for eMBB, mMTC, and URCCL using different numerologies, anda common synchronization signal may be transmitted through specific 5Gresources using one numerology. With respect to the system information,common system information may be transmitted through specific 5Gresources using one numerology, and separate system information may betransmitted for eMBB, mMTC, and URLLC using different numerologies. Thesystem information and the higher configuration information may includeconfiguration information indicating whether to use the slot or themini-slot for data transmission and reception, the number of OFDMsymbols of the slot or the mini-slot, and the numerology therefor.Further, if reception of a downlink common control channel is configuredin the terminal, the system information and the higher configurationinformation may include configuration information related to receptionof the downlink common control channel. When the terminal controls thepower of uplink transmission, configuration information related to powercontrol may be included.

In step 422, the 5G-capable terminal 303 transmits and receives data forthe 5G service to and from the base station 301 through 5G resources.When transmitting and receiving data to and from the base station, theterminal may receive a downlink control channel including schedulinginformation of the data, attempt decoding, and insert a command,required by the terminal for controlling uplink power, into the downlinkcontrol channel.

FIG. 5 illustrates PUCCH transmission in the 5G system.

FIG. 5 shows multiplexing of the long PUCCH and the short PUCCH in thefrequency region (FDM 500) and multiplexing of the long PUCCH and theshort PUCCH in the time region (TDM 501). Referring to FIG. 5 , the longPUCCH and the short PUCCH are transmitted over various OFDM symbols inone slot. First, the structure of the slot in which the long PUCCH andthe short PUCCH are multiplexed will be described with reference to FIG.5 . Reference numerals 520 and 521 indicate UL-centric slots in whichuplink is mainly used in the slot, which is a basic transmission unit of5G (various names such as “subframe” or “transmission time interval(TTI)” may be used, but “slot”, which is a basic transmission unit, isused in the disclosure). In the UL-centric slot, most OFDM symbols areused for uplink, and all OFDM symbols may be used for uplinktransmission, or leading OFDM symbols may be used for downlinktransmission. If both the downlink and the uplink exist in one slot,there may be a transmission gap therebetween. In FIG. 5 , a first OFDMsymbol in one slot may be used for downlink transmission, for example,downlink control channel transmission 502, and symbols from a third OFDMsymbol may be used for uplink transmission. A second OFDM symbol is usedfor the transmission gap. In uplink transmission, uplink data channeltransmission and uplink control channel transmission can be performed.

Subsequently, a long PUCCH 503 will be described. A control channel of along transmission interval is used to increase cell coverage, and thusmay be transmitted through a DFT-S-OFDM scheme for short carriertransmission rather than OFDM transmission. Accordingly, at this time,only consecutive subcarriers should be transmitted, and uplink controlchannels of the long transmission interval are configured at separatedlocations as indicated by reference numerals 508 and 509 in order toacquire a frequency diversity effect. The number of OFDM symbolssupported for long PUCCH transmission in the time region is 4 to 14. Aseparated distance 505 in the frequency region should be smaller thanthe bandwidth supported by the terminal, and transmission is performedusing PRB-1 in the front part of the slot as indicated by referencenumeral 508 and transmission is performed using PRB-2 in the back partof the slot as indicated by reference numeral 509. The PRB is a physicalresource block, may be the minimum transmission unit in the frequencyregion, and may be defined by 12 subcarriers. Accordingly, the frequencydistance between PRB-1 and PRB-2 should be smaller than the maximumbandwidth supported by the terminal, and the maximum bandwidth supportedby the terminal may be equal to or smaller than the bandwidth 506supported by the system. Frequency resources PRB-1 and PRB-2 may beconfigured in the terminal through a higher-layer signal and frequencyresources may be mapped to a bit field through a higher-layer signal.The frequency resources to be used may be indicated to the terminalthrough the bit field included in the downlink control channel. Each ofthe control channel transmitted in the front part of the slot 508 andthe control channel transmitted in the back part of the slot 509 mayinclude uplink control information (UCI) 510 and a terminal referencesignal 511, and it is assumed that the two signals are transmitted indifferent OFDM symbols in a time-division manner.

Subsequently, a short PUCCH 518 will be described. The short PUCCH maybe transmitted through both the DL-centric slot and the UL-centric slot,and may generally be transmitted through the last symbol of the slot oran OFDM symbol in the back part (for example, the last OFDM symbol, thesecond-to-last OFDM symbol, or the last two OFDM symbols). Of course,the short PUCCH can be transmitted at a random location within the slot.The short PUCCH may be transmitted using one OFDM symbol or a pluralityof OFDM symbols. In FIG. 5 , the short PUCCH is transmitted in the lastsymbol 518 of the slot. Radio resources for the short PUCCH may beallocated in units of PRBs from the aspect of frequency, and a pluralityof consecutive PRBs may be allocated, or a plurality of PRBs separatedfrom each other in the frequency band may be allocated. The allocatedPRBs should be included in a band equal to or smaller than the frequencyband 507 supported by the terminal. The plurality of PRBs, which are theallocated frequency resources, may be configured in the terminal througha higher-layer signal, the frequency resources may be mapped to a bitfield through the higher-layer signal, and the frequency resources to beused may be indicated to the terminal by the bit field included in thedownlink control channel. Uplink control information 530 and ademodulation reference signal 531 should be multiplexed within one PRBin the frequency band, and there may be a method of transmitting ademodulation reference signal to one subcarrier for every two symbols,as indicated by reference numeral 512, a method of transmitting ademodulation reference signal to one subcarrier for every three symbols,as indicated by reference numeral 513, or a method of transmitting ademodulation reference signal to one subcarrier for every four symbols,as indicated by reference numeral 514.

Examples in which PUCCH transmission is performed in various OFDMsymbols have been described with reference to FIG. 5 .

Next, an example in which transmission of the PUSCH and the SRS or thePUCCH is performed in various OFDM symbols will be described withreference to FIG. 6 .

In FIG. 6 , reference numeral 601 indicates a downlink control channel,which may be a terminal-common control channel or a terminal-specificcontrol channel. The terminal-common control channel includesinformation that can be indicated to terminals in common, such asinformation about the construction of the slot or the mini-slot. Theterminal-specific control channel includes terminal-specific informationsuch as data transmission frequency location information for uplink datascheduling.

In FIG. 6 , reference numeral 603 indicates an uplink data channel, andthe data channel includes uplink data and an RS required fortransmission of the uplink data.

In FIG. 6 , reference numeral 603 indicates an uplink control channel,and the control channel includes uplink control information and an RSrequired for transmission and reception of the uplink controlinformation.

In FIG. 6 , reference numeral 604 indicates time and frequency regionsin which downlink transmission can be performed in one slot.

In FIG. 6 , reference numeral 605 indicates time and frequency regionsin which uplink transmission can be performed in one slot.

In FIG. 6 , reference numeral 606 indicates time and frequency regionsrequired for an RF change from downlink to uplink in one slot.

In FIG. 6 , reference numeral 607 indicates an uplink sounding referencesignal.

First, in a UL-centric slot 611 of one slot interval 608, a transmissionOFDM symbol internal of uplink data may vary in units of OFDM symbolsaccording to a start OFDM symbol and an end OFDM symbol (or an intervallength) of uplink data. Time and frequency regions in which the downlinkcontrol channel 601, the uplink data channel 602, and the uplinksounding reference signal 607 are transmitted are illustrated in theUL-centric slot 611 of FIG. 6 . The uplink data channel 602 may starttransmission in an uplink region 605, and the base station should informthe terminal of the slot within which the uplink sounding referencesignal is transmitted in the uplink region 605 and of the OFDM symbol,in which the uplink sounding reference signal is transmitted, in orderto avoid a transmission collision with the sounding reference signal 607of other terminals. As a result, the transmission OFDM symbol intervalof the uplink data 602 may be transmitted in only some OFDM symbolswithin the uplink region 605.

Next, the situation in which the transmission OFDM symbol internal ofuplink data varies in the UL-only slot 621 of one slot interval 608 willbe described. The time and frequency regions in which the uplink datachannel 602 and the uplink control channel 603 are transmitted in theUL-only slot 621 of FIG. 6 are illustrated. The uplink data channel 602may start transmission from the first OFDM symbol of the uplink region605, and the time and frequency regions of the uplink control channel603 of other terminals cannot be known. Accordingly, in order to avoid acollision of time and frequency regions of the uplink control channel603 with other terminals, the base station should inform one terminal ofthe OFDM symbols within the uplink region 605 in one slot in which theterminal can transmit the uplink data channel 602.

As described in FIG. 6 , due to the time and frequency regions in whichthe PUSCH, the PUCCH, and the sounding reference signal (SRS) of theterminals are transmitted, the number of transmission OFDM symbols ofthe uplink data channel, the uplink control channel, and the uplinksounding reference signals may vary.

As described with reference to FIGS. 5 and 6 , if the uplinktransmission interval varies in units of OFDM symbols, a method ofcontrolling the power of uplink transmission on the basis of the numberof transmission OFDM symbols will be described. A method of controllingthe power of uplink transmission to satisfy the reliability required foruplink transmission of a service such as URLLC, having ultra reliabilityas a requirement thereof, will be additionally described.

First, controlling the power of uplink transmission in NR, as proposedby the disclosure, is described. Particularly, each of power controlmethods used for the PUCCH, the PUSCH, and the SRS is described on thebasis of [Equation 1], [Equation 2], and [Equation 3]. Hereinafter,controlling the transmission power of the PUCCH is mainly described, butembodiments of the disclosure can be applied to transmission power ofthe PUSCH or the SRS without any limitation.

In the NR system, the terminal transmits the PUCCH, the PUSCH, and theSRS by controlling the transmission power of uplink transmission. Theterminal may control transmission power of uplink control information ofthe PUCCH to a value calculated using [Equation 1] below.

P _(PUCCH)(i)=min{P _(CMAX,c)(i),q ₁(i)}[dBm] where q ₁(i)=P _(O_PUCCH)+PL _(c) +h(n _(CQI) ,n _(HARQ) ,n _(SR)+10 log₁₀(M_(PUCCH,c)(i))+Δ_(F_PUCCH)(F)+Δ_(TxD)(F′)+g(i)  [Equation 1]

The terminal may control transmission power of uplink data informationof the PUSCH to a value calculated using [Equation 2] below.

P _(PUSCH,c)(i)=min{P _(CMAX,c)(i),q ₂(i)}[dBm] where, q ₂(i)=P_(O_PUSCH,c)(j)+α_(C)(j)*PL _(C)+10 log₁₀(M _(PUSCH,c)(i))+Δ_(TF,c)(i)+f_(c)(i)  [Equation 2]

The terminal may control transmission power of the uplink soundingreference signal of the SRS to a value calculated using [Equation 3]below.

P _(SRS,c)(i)=min{P _(CMAX,c)(i),q ₃(i)}[dBm] where, q ₃(i)=P_(SRS_OFFSET,c)+(m)+10 log₁₀(M _(SRS,c))+P _(O_PUSCH,c)(j)++_(c)(j)*PL_(c) +f _(c)(i)  [Equation 3]

In [Equation 1], i denotes an index of the slot, P_(CMAX,c)(i) denotesthe maximum transmission power of the terminal in one slot, P_(O_PUCCH)denotes the sum of an initially set terminal-related value and aninitially set cell-related value configured by the base station, andPL_(c) denotes a value for compensating for path loss between the basestation and the terminal. Further, in [Equation 1],h(n_(CQI),n_(HARQ),n_(SR)) and Δ_(F_PUCCH)(F) denote a format for uplinkcontrol information, that is, a PUCCH format and a factor configureddifferently according to the amount of uplink control information.Δ_(F_PUCCH)(F) is indicated to the terminal by the base station throughhigher-layer signaling and is configured as a value in sets of aplurality of integer values according to each format for uplink controlinformation. Moreover, h(n_(CQI),n_(HARQ),n_(SR)) and Δ_(F_PUCCH)(F) arecomplementary to each other, and if transmission power set ash(n_(CQI),n_(HARQ),n_(SR)) is excessive or insufficient,h(n_(CQI),n_(HARQ),n_(SR)) may be compensated for by Δ_(F_PUCCH)(F). Atthis time, on the basis of a PUCCH format requiring the smallest powervalue, Δ_(F_PUCCH)(F) sets a relative power value required for anotherPUCCH format. That is, if it is assumed that PUCCH format A, PUCCHformat B, and PUCCH format C are defined for the long PUCCH format inNR, an absolute power value of PUCCH format A is first determined as 0dB, and then a relative power value, required according to a format foranother piece of uplink control information or the amount and type ofthe uplink control information, is assigned. If a signal-to-noise ratio(SNR) required for acquiring an error probability of 1% is −6 dB whenPUCCH format A is used and an SNR required for acquiring an errorprobability of 1% is 1 dB when PUCCH format B is used, Δ_(F_PUCCH)(F)sets 0 dB for PUCCH format A and 7 dB for PUCCH format B. At this time,the original value of −6 dB, required for acquiring the errorprobability of 1% in PUCCH format A, is reflected in PO_PUCCH.

h(n_(CQI),n_(HARQ),n_(SR)) is an equation for differently controllingpower on the basis of the number of input bits according to the formatfor uplink control information, that is, each of various PUCCH formatsin the NR system.

M_(PUCCH,c(i)) is an equation for reflecting the amount of transmissionfrequency resources set for PUCCH transmission.

g(i) is a power value of slot i when a value (δ) transmitted to bedynamically changed by the PDCCH which can be transmitted in every slotis applied, and g(i) of slot i may be configured by accumulating the δvalue in g(i−1), which is g(i) of the previous slot, or may beconfigured as an absolute value by ignoring the value of the previousslot and applying only a value indicated by the corresponding slot.

q1(i) for controlling power transmission of the short PUCCH or the longPUCCH can be configured by summing at least one of the above-describedequations, and q1(i) is an equation that should be basically consideredfor controlling the uplink power of the PUCCH.

In [Equation 2], i denotes an index of the slot, P_(CMAX,c)(i) denotesthe maximum transmission power of the terminal in one slot,P_(O_PUCCH,c)(j) denotes the sum of an initially set terminal-relatedvalue and an initially set cell-related value configured by the basestation, and α_(c)(j)*PL_(c) denotes a value for compensating for pathloss between the base station and the terminal. M_(PUSCH,c)(i) is tocontain the amount of transmission frequency resources scheduled forPUSCH transmission. ΔTF,c(i) is to contain a modulation scheme and acoding rate of the MCS, and f_(c)(i) is a power value of slot i when avalue (δ) transmitted to be dynamically changed by the PDCCH which canbe transmitted in every slot. f_(c)(i) of slot i may be configured byaccumulating the 6 value in f_(c)(i-1), which is f_(c)(i) of theprevious slot, or may be configured as an absolute value by ignoring thevalue of the previous slot and applying only the value indicated by thecorresponding slot.

In [Equation 3], i denotes the index of the slot, P_(CMAX,c)(i) denotesthe maximum transmission power of the terminal in one slot,P_(SRS_OFFSET,c) and P_(O_PUCCH,c)(j) denote the sum of an initially setterminal-related value and an initially set cell-related valueconfigured by the base station, and α_(c)(j)*PL_(c) denotes a value forcompensating for path loss between the base station and the terminal.M_(SRS,c) is to contain the amount of transmission frequency resourcesset for SRS transmission. f_(c)(i) is a power value of slot i when avalue (δ) transmitted to be dynamically changed by the PDCCH which canbe transmitted in every slot is applied, and f_(c)(i) of slot i may beconfigured by accumulating the δ value in f_(c)(i−1), which is f_(c)(i)of the previous slot, or may be configured as an absolute value byignoring the value of the previous slot and applying only the valueindicated by the corresponding slot.

Next, a method of controlling power according to the number oftransmission symbols of the PUCCH, the PUSCH, and the SRS will bedescribed. In a first embodiment, an equation of h(n_(symbol)), havingthe number of transmission symbols as the input, is added to q₁(i),q₂(i), q₃(i) in order to control power according to the number oftransmission symbols of the PUCCH, the PUSCH, and the SRS. In order todetermine the power value according to h(n_(symbol)), not only theequation but also the transmission power value according to the numberof transmission OFDM symbols of the PUCCH, the PUSCH, and the SRS can bedefined as a table.

In a second embodiment, coefficients w1, w2, and w3 according to thenumber of transmission symbols are multiplied by t₁(i), t₂(i), and t₃(i)corresponding to linear values obtained through conversion of q₁(i),q₂(i), and q₃(i) in order to control power according to the number oftransmission symbols of the PUCCH, the PUSCH, and the SRS in q₁(i),q₂(i), and q₃(i).

If it is assumed that the power values considering transmission of thePUCCH, the PUSCH, and the SRS in all OFDM symbols in one slot are q₁(i),q₂(i), and q₃(i), respectively, power values in 1 OFDM symbol may be avalue obtained by dividing q₁(i), q₂(i), and q₃(i) by the number of allOFDM symbols. Available examples of the first embodiment and the secondembodiment are shown in [Table 2] and [Table 3], respectively. At thistime, there is an advantage of keeping the change in transmission powerin one slot to a minimum.

TABLE 2 n_symbol h(n_symbol) 1 A (=0) 2 B 3 C . . . . . . 14  D (=P_(CMAX))

TABLE 3 n_symbol w 1 A′ (=1/14) 2 B′ 3 C′ . . . . . . 14  D′ (=1)

On the other hand, a method of increasing transmission power to maintainthe transmission power in one slot even in transmission of the PUCCH,the PUSCH, and the SRS in 1 or 2 OFDM symbols may be considered in orderto keep the uplink coverage according to transmission power in one slot.Available examples of the first embodiment and the second embodiment areshown in [Table 4] and [Table 5], respectively.

TABLE 4 n_symbol h(n_symbol) 1 A (=P _(CMAX)) 2 B 3 C . . . . . . 14  D(=0)

TABLE 5 n_symbol w 1 A′ (=1) 2 B′ 3 C′ . . . . . . 14  D′ (=1/14)

In a third embodiment, different values may be applied to δ,corresponding to a TPC command according to the number of transmissionOFDM symbols of the PUCCH, the PUSCH, and the SRS. Instead of δ, k*δ,obtained by multiplying δ by the coefficient k, is applied according toa set of the numbers of PUCCH transmission OFDM symbols. For example, adifferent value of k may be applied to 7<n_(symbol)≤14 and1<n_(symbol)≤7. Alternatively, different TPC commands may be appliedaccording to the number of PUCCH transmission OFDM symbols, as shown in[Table 6]. For example, set A may be applied to 7<n_(symbol)≤14 and setB may be applied to 1<n_(symbol)≤7.

TABLE 6 TPC command δ field in DCI Set A [dB] Set B [dB] 0 −1 −1 1 0 0 21 2 3 3 6

Subsequently, a method of controlling power when PUCCH transmission of aservice such as URLLC, having ultra reliability as a requirementthereof, is performed is described. The terminal may be aware ofscheduling of URLLC data from the DCI size of a downlink control channelthrough which scheduling of a downlink data signal is received, settingof a specific field, or a separate RNTI for URLLC. Alternatively, theterminal may be aware of scheduling of URLLC data through configurationof a higher-layer signal for URLLC or configuration of a transmissionmode for URLLC. Accordingly, the terminal may know that an uplinkcontrol channel for downlink data scheduled by the downlink controlchannel is transmitted. Alternatively, the terminal may know that URLLCuplink data transmission should be performed by mapping of a higherpacket IP of the terminal or a port number or mapping of a specificlogical channel ID. Alternatively, if the terminal is scheduled orconfigured to perform uplink transmission in specific uplink resources,the terminal may determine that the uplink is for URLLC. In a fourthembodiment, the terminal adds a field for applying a power valueaccording to power boosting to a table in which a TPC command and δ,which is a power value to be applied, are defined. If a field accordingto the case in which power boosting is needed is added as shown in[Table 7] and the base station indicates application of the field, andif the terminal receives indication by the field, the field may beapplied. A power increase value according to power boosting may beconfigured by a higher-layer signal, or may be defined as shown in thefollowing table according to a standard.

TABLE 7 TPC command field in DCI δ[dB] 0 −1 1 0 2 1 3 “Power Boosting”

FIG. 7 illustrates procedures of the base station and the terminalaccording to embodiments of the disclosure.

First, the base station procedure will be described.

In step 711, the base station transmits uplink power controlconfiguration information to the terminal. If the PUCCH, the PUSCH, andthe SRS are transmitted in various OFDM symbol intervals or in order tosatisfy reliability, the uplink power control configuration informationincludes information required to be configured through a higher-layersignal for power control, and may be transmitted to the terminal throughthe higher-layer signal.

In step 712, the base station transmits an uplink power control commandto the terminal according to the disclosure. If the PUCCH, the PUSCH,and the SRS are transmitted in various OFDM symbol intervals asdescribed in the embodiment of FIG. 6 or in order to satisfyreliability, the uplink power control command includes informationrequired for controlling power and is transmitted to the terminalthrough a downlink control channel.

In step 713, the base station receives the uplink channel or the uplinksignal, configured or indicated to control uplink power in step 711 or712, from the terminal.

Next, the terminal procedure will be described.

In step 721, the terminal receives uplink power control configurationinformation from the base station. If the PUCCH, the PUSCH, and the SRSare transmitted in various OFDM symbol intervals or in order to satisfyreliability, the uplink power control configuration information includesinformation required to be configured through a higher-layer signal forpower control, and may be received from the base station through thehigher-layer signal.

In step 722, the terminal receives an uplink power control command fromthe base station according to the disclosure. If the PUCCH, the PUSCH,and the SRS are transmitted in various OFDM symbol intervals asdescribed in the embodiment of FIG. 6 or in order to satisfyreliability, the uplink power control command includes informationrequired for controlling power and is received from the base stationthrough a downlink control channel.

In step 723, the terminal transmits the uplink channel or the uplinksignal configured or indicated to control uplink power in step 711 or712 to the base station.

Next, FIG. 8 illustrates a base station apparatus according to thedisclosure.

A controller 801 controls transmission resources required forconfiguring uplink power control according to the base station procedureillustrated in FIG. 7 of the disclosure and the uplink power controlmethod illustrated in FIG. 6 of the disclosure, performs transmission tothe terminal through a 5G control information transmission device 805and a 5G data transmission/reception device 807, schedules 5G datathrough a scheduler 803, and transmits/receives 5G data to/from the 5Gterminal through the 5G data transmission/reception device 807.

Next, FIG. 9 illustrates a terminal apparatus according to thedisclosure.

A controller 901 receives information required for configuring uplinkpower control and a power control command from the base station througha 5G control information reception device 905 and a 5G datatransmission/reception device 906 according to the terminal procedureillustrated in FIG. 7 of the disclosure and the uplink power controlmethod illustrated in FIG. 6 of the disclosure, controls power fortransmission of 5G data scheduled at the received resource location inthe uplink through the 5G data transmission/reception device 906, andperforms transmission/reception with the 5G base station.

The embodiments disclosed in the specifications and drawings areprovided merely to readily describe and to help a thorough understandingof the disclosure but are not intended to limit the scope of thedisclosure. Therefore, it should be construed that, in addition to theembodiments disclosed herein, all modifications and changes or modifiedand changed forms derived from the technical idea of the disclosure fallwithin the scope of the disclosure.

What is claimed is:
 1. A method performed by a terminal in acommunication system, the method comprising: receiving, from a basestation via higher layer signaling, a configuration includinginformation associated with a number of physical uplink control channel(PUCCH) symbols for a PUCCH format; receiving, from the base station ona physical downlink control channel (PDCCH), a power control command fora PUCCH; identifying a transmission power for the PUCCH based on thepower control command for the PUCCH and a PUCCH transmission poweradjustment component, wherein the PUCCH transmission power adjustmentcomponent is obtained by the number of the PUCCH symbols for the PUCCHformat and the PUCCH transmission power adjustment component isincreased as the number of the PUCCH symbols for the PUCCH format isdecreased; and transmitting, to the base station, the PUCCH based on thetransmission power.
 2. The method of claim 1, wherein the configurationfurther includes information associated with a P0 value and informationassociated with a delta value associated with the PUCCH format, andwherein the P0 value and the delta value are further used to identifythe transmission power.
 3. The method of claim 1, wherein the deltavalue is configured as on value among a plurality of integer values. 4.The method of claim 1, wherein the configuration further includesinformation associated with an uplink subcarrier spacing for the PUCCH,and wherein the uplink subcarrier spacing is further used to transmitthe PUCCH.
 5. The method of claim 1, wherein the number of PUCCH symbolsvaries from 4 to
 14. 6. A method performed by a base station in acommunication system, the method comprising: transmitting, to a terminalvia higher layer signaling, a configuration including informationassociated with a number of physical uplink control channel (PUCCH)symbols for a PUCCH format; transmitting, to the terminal on a physicaldownlink control channel (PDCCH), a power control command for a PUCCH;and receiving, from the terminal, the PUCCH transmitted based on atransmission power, wherein the transmission power is based on the powercontrol command for the PUCCH and a PUCCH transmission power adjustmentcomponent, and wherein the PUCCH transmission power adjustment componentis obtained by the number of the PUCCH symbols for the PUCCH format andthe PUCCH transmission power adjustment component is increased as thenumber of the PUCCH symbols for the PUCCH format is decreased.
 7. Themethod of claim 6, wherein the configuration further includesinformation associated with a P0 value and information associated with adelta value associated with the PUCCH format, and wherein the P0 valueand the delta value are further used to identify the transmission power.8. The method of claim 6, wherein the delta value is configured as onvalue among a plurality of integer values.
 9. The method of claim 6,wherein the configuration further includes information associated withan uplink subcarrier spacing for the PUCCH, and wherein the uplinksubcarrier spacing is further used to receive the PUCCH.
 10. The methodof claim 6, wherein the number of PUCCH symbols varies from 4 to
 14. 11.A terminal in a communication system, the terminal comprising: atransceiver; and a controller coupled with the transceiver andconfigured to: receive, from a base station via higher layer signaling,a configuration including information associated with a number ofphysical uplink control channel (PUCCH) symbols for a PUCCH format,receive, from the base station on a physical downlink control channel(PDCCH), a power control command for a PUCCH, identify a transmissionpower based on the power control command for the PUCCH and a PUCCHtransmission power adjustment component, wherein the PUCCH transmissionpower adjustment component is obtained by the number of the PUCCHsymbols for the PUCCH format and the PUCCH transmission power adjustmentcomponent is increased as the number of the PUCCH symbols for the PUCCHformat is decreased, and transmit, to the base station, the PUCCH basedon the transmission power.
 12. The terminal of claim 11, wherein theconfiguration further includes information associated with a P0 valueand information associated with a delta value associated with the PUCCHformat, and wherein the P0 value and the delta value are further used toidentify the transmission power.
 13. The terminal of claim 11, whereinthe delta value is configured as on value among a plurality of integervalues.
 14. The terminal of claim 11, wherein the configuration furtherincludes information associated with an uplink subcarrier spacing forthe PUCCH, and wherein the uplink subcarrier spacing is further used totransmit the PUCCH.
 15. The terminal of claim 11, wherein the number ofPUCCH symbols varies from 4 to
 14. 16. A base station in a communicationsystem, the base station comprising: a transceiver; and a controllercoupled with the transceiver and configured to: transmit, to a terminalvia higher layer signaling, a configuration including informationassociated with a number of physical uplink control channel (PUCCH)symbols for a PUCCH format, transmit, to the terminal on a physicaldownlink control channel (PDCCH), a power control command for a PUCCH,and receive, from the terminal, the PUCCH transmitted based on atransmission power, wherein the transmission power is based on the powercontrol command for the PUCCH and a PUCCH transmission power adjustmentcomponent, and wherein the PUCCH transmission power adjustment componentis obtained by the number of the PUCCH symbols for the PUCCH format andthe PUCCH transmission power adjustment component is increased as thenumber of the PUCCH symbols for the PUCCH format is decreased.
 17. Thebase station of claim 16, wherein the configuration further includesinformation associated with a P0 value and information associated with adelta value associated with the PUCCH format, and wherein the P0 valueand the delta value are further used to identify the transmission power.18. The base station of claim 16, wherein the delta value is configuredas on value among a plurality of integer values.
 19. The base station ofclaim 16, wherein the configuration further includes informationassociated with an uplink subcarrier spacing for the PUCCH, and whereinthe uplink subcarrier spacing is further used to receive the PUCCH. 20.The base station of claim 16, wherein the number of PUCCH symbols variesfrom 4 to 14.